Automatic telephone system



Oct. 25, '1927. t I 1,646,421 I A. J. RAY v I AUTOMATIC TELEPHONE sismmFiled Dec. 1. 1924 2 Sheets-Sfiept N Oct. 25,1927. A. J. RAY- AUTOMATICTELEPHONE SYSTEM Filed Dec. 1. 1924 "2 She ets-Sheet 2 b a I w; 00 1 5 QQ fii i i w N i :r nusnub- EIT'YZ'ZUPJEE Patented Oct. 25, 1927.

UNITED srAras ARTHUR J. RAY, or onrcacio, ILLINOIS,

ASSIGNOR, ga ma assreixnvrnnrs, T0

AUTOMATIC ELECTRIC INC, OF CHICAGO, ILLINOIi A. CORPORATION OF DELA'WARE.

1 AUTOMATIC TELEPHONE SYSTEll/IJ Application filed December Thisinvention relates in general to auto.- matic telephone systems, but moreespecially to automatic systems of relatively small size, commonly knownas private automatic exchanges.

Systems of the above character havebeen standardized for installation atpoints where individual lines only are in service and owing largely tothis fact they are relatively simple and inexpensive. Another type i ofsystem, known as a community automatic exchange, has been developed forusein places where the service is more or less of a mixed character andespecially where. there are a large number of rural lines in service.Code ringing is required to signal the stations on rural lines and thecommunity automatic ex changes therefore are characterized by the use ofmore or less complicated code ringing connectors,.which are somewhatexpensive. Now it may happen sometimes that a small automatic exchangeis to be installed at a point where there are only a very few rurallines in service, fromwvhich it will be understood that the privateautomatic cx-,

change, as distinguished from the community automatic exchange, would beentirely satisfactory and the most economical provided some specialmeans could be provided, in addition to the ordinary equipment, forsignalling the stations on the rural. lines. I l

The object'ot the present invention, therefore, is to provide a new andimproved device, an individual rural line repeater,whereby a pluralityof substations on a ruralline can be rung selectively by. means of codescontrolled by the dial at the calling station, thus dispensing with coderinging connectors and making it possible to use the ordinary privateautomatic exchange in .situations to which it otherwise would not beapplicable.

The above pointed out object, together with others not specificallymentioned at this time, will be pointed out and explained more "fullyhereinafter, reference being had to the accompanying drawings, in which7 Fig. 1 is a circuit diagram of an automatic substation A, rotary typeline switches C and. C, and connector repeater D.

Fig.2 is a circuit diagram of an individual line repeater R and threemagneto local battery substations A, A and A on 1, 1924.. SeriallNo.753,016.

the same line, the latter two having only their bells shown" Proceedingnow to the detailed e xplanar tion 01". the circuit drawings. andreferring first to Fig. 1, the automatic telephone substationu i-isconnected in bridge of a pair ojltalking conductors and is arranged forstraight line ringing. As represented here= unsubstationA comprisesessentially thereceiver 2,fswitch-hook 3,'transmitter 4, conzdenser5,.bell 6, and. callingdevice 7. The line conductor-s11 and 12 of thesubstation A terminate at the central office in the individual. line.switchf Gand when a call is originated at the substation A, substationA s given access, through the medium of the line switch, to a pluralityof connector'repeaterswitchesone of which'is shown as D.

The ,;indivi.dual lineswitches, of which the line switch U is typical,are mechanically of the rotary type andthe wipers have no normalposition and move in a forward diy rection only.

The connector repeater D is mechanicallyl of theflwell known verticaland .rotarytype of switch and has its bankcontacts arranged n. tenhorizontal'ro'ws or levels; Its circuit is arranged so. as to enable theswitch to operate as a local connector .forfthe first nine levels, butto be non-rotary and to switch and repeat on the tenth or 0 level;Referriugto Fig. '2, the substations A", A and iii-thelatter two ofwhich have only their bells shown, arein bridge of the line, are o't themagneto local battery ty'pe arranged: forsimplex dialling, and arecapable of being rung by either the individual stationhand generators orthe common genera? tor GEN. [As represented herein, 'substa tion Acomprises essentially the receiver 1 62, switch-hook 163, transmitter164, bell' 165, calling device 166, induction coil167 and local battery168. {The linecon-ductors 1 51 and 152 of thesubstations A, A and Aiterminate at the central ofiice in the inpester switches, such as D.

The individual'lme repeaters, such as R, consist essentially of aplurality of relays, a repeating coil I, togetherwith associated commonringing generator GEN. to deliver the desired ringing current, andsuitablecircuits for performing the necessary functions, as will bepointed out hereinafter.

Having briefly explained the purpose of the invention and the apparatusinvolved in carrying it out, the operation of the equipment may now beexplained more in'detail."

For this purpose it will be assumed that the subscriber at stationA,-Fig. 1, desires to ob- .tion A, a circuit is completed over the lineconductors 11 and 12 for the line relay 13 of the line switch 0. "Uponenergizing, the line relay 13 closes at its armature 16 a circuit whichincludes the switchingrelay l t'and thestepping magnet 15 in series, andat its armature 17 connects the test wiper 22 to the above circuit at apoint midway between the switching relay and the said magnet. Theoperation now depends upon I whether the trunk line with which thewipers of the line switch C are associated is busy or is not busy.

If the trunk lineis busythe test contact with which the test wiper 22 isin engage ment will'be grounded, and as a result the switching relay 14will be short circuited and the stepping magnet 15, being supplied withdirect ground by way of the test wiper, will operate as a buzzer toadvance the switch wipers step bystep in search of an idle trunk line Itmay be assumed, in this case, that when the call is initiated the wipersof the line switch C are rotated until they come to rest on the bankcontacts of the trunk line shown in the drawing, and it may i be assumedfurthermore that the trunkline extendingfrom these bank contacts isidle. Under these circumstances the test contact 25 will have no groundpotential upon it andwhen the receiver is removed the energization ofthe line relay 13is followed immediately by the energization of theswitching relay 14. It may be stated atv this point that the switchingrelay is of high resistance so as to prevent the operation of thestepping magnet 15 at this time. As a result of the energization of theswitching relay 14. the line conductors 11 and 12 are disconnected fromthe line relay 13 and from ground, respectively, and are extended by wayof armatures 18 and 20, wipers 21 and 28, and bank contacts 24 and 26 tothe upper andlower windings of the double-wound line relay 40 of theconnector repeater D.

When the calling line is extended to the switch D as above described,the line relay 40 is energized over the line circuit in the usual mannerand completes a circuit for the slow to release relay 41. Uponenergizing, the latter relay prepares a circuit for the vertical magnet49 at armature 57, and at armature 56 connects ground to the releaset-runlr conductor 85, thereby closing a hold mg circuit for the lineswitch C which extends by wayof the test contact 25, test wiper 22,armature 19 and its working contact,:winding of the switching relay 14,and the winding of the stepping magnet 15 to battery. The above circuitis completed before the slow acting line relay 13 has had time todeenergize and serves to maintain cuit, to whichthe line relay 4C0responds by deenergizing a corresponding plurality of times. At thefirst deenergization the line relay transmits a current impulse to thevertical magnet 49 over the following path: grounded armature 54 andits-resting contact, armature 57 and its working contact, restingcontact and off normal spring 53, winding of the slow to release seriesrely 42, and winding of the vertical magnet 49 to battery. The above isthe circuit over which the first impulse is transmitted. At the firstupward movement of the shaft the normal springs are shifted "and thecircuit is completed over a new path which is the same as the onepreviously tracedexcept that it includes the normally open contactcontrolled by spring 53and armature 58 of the series relay 4:2 and itsworking contact, the said series relay being new in operated position.

raised step by step until they stand opposite the level of bankcontacts'in which is located the set of contacts associated with theline including substation'A which in this case isthe tenth or 0 level.The slow to release series relay 42, which is energized in series withthe vertical magnet, maintaHlS its armature attracted throughout thevertical operation of the switch, and at the By the operation of thevertical magnet 49' the wipers 7547, inclusive, are

contactby the operation. of the shaft, This may be accomplished by anysuitable-cam arrangement. -A circuit is thereby com-' pleted for relay44 in series with the lower winding of the ring cut oil relay 45. Boththese relays are energized and the latter re lay disconnectsthe ringingcurrentatarmature 63, extends the talking conductors to the armatures 70and 74 at armatures 01 and 63 and locksi-tsel'fup over the release trunkconductor 85 at armature 62. Relay 44, upon energizing, connects the twowindings of the impedance coil 43 in bridge of the-talking conductors inan obvious mans L ner.

The calling subscriber may now operate his calling device "in accordancewith the second digit 4 in the desired number. 'As before, a series ofinterruptions is produced in the line circuit to which the line relay 40again responds by transmitting a series of four impulses to the rotarymagnet 50 overthe following path: grounded armature 54 and its restingcontact, armature 57 and its working contact, resting Contact andnormally open contact coi'itrolled by oil normal spring 53, armature 58"andiits resting contact, resting contact and" armature 66, armature 7 3'and its resting contact, and

the winding of the rotary magnet 50 to bat} tery. Responsive to theseimpulses the r tary magnet is operated to rotate the switch wipers intoengagement with the fourth set of bank contacts, in which the lineinc'lud ing the substation i. terminates, these bank cuit for the rotarymagnet over a path which isindependent ot' the contacts controlled byarmature 60 of the test relay'46. This latter operation is to guardagainstthe possibility of the circuit forthe rotary magnet being openedat armature 66 in case the test relay is energized due to the test wiper7 6 passing over busy test contacts. Assumingfirst that the lineincludingsubstation A is busy when connection thereto is es tablished asjust described, the test wiper" 7 6, when it comes to rest in engagementwith the test contact 7 9, will find a ground potential thereon and thetest relay 46 will be operated. Upon energizing, the test relay preparesa locking circuit for itself at its armature (completed when relay'47deenergizes), and at its armature '64'connects a lead from the busysignalling machine to the lower heavy talking conductor. By this meansthe calling subscriber is given anau dible busy signal, andbeing advisedthereby what the desired line: is for the: time being inaccessible, hewill hang up his receiver and release the connection. I I

Having described the operations. which take place when the called lineis: busy, it will now be assumed that the called line. is

idle when the connection is attempted Under these circumstances, whenthe test wiper 76 comes to L'GSt'lIl engagement with test contact 7 9 itwill not find ground potential 1 and the test relay 46 will not beenergized. Then when the slow to release relay 47 defenergizes atthe;end of the. rotary movement of the switch amultiple circuit will becom-- pleted as follows from the grounded release.

trunk conduct-or 85, by way of armature 65 y and its resting contact,lower winding ref sw tching relay 48, resting contact and armature 68,normally closed contact/com trolled by armature 71, test wiper 76,;and?" test contact-79' to a point'where the circuit branches two ways,one branch extending: by

way of private'normal conductor 121, rest ing contact and armature 138,and. the wind ing of relay 124 to-battery; while: the other;

branch extends by way of private normal i conductor 101, the 1 winding"of switching re-r lay 104, andthe winding of stepping mags net '105'tobattery. Upon theclosure' of the. above circuit relays 104, 48 and 124are met-- gized and the latter relay is operated to/prepare the circuitof line relay 123 in the in dividual linerepeater B. 'At the lineswitchG" the switching relay 104 is operatedv i301 clear theline of substationA of normal battery and ground connections- This relay operates onlyabout half way, due'to the fact that the line relay 103 has. not. beenenergized, and the'l'ine conductors are not con nected through to thewipers of the line switch. At-the connector repeater D when theswitching relay 48 is energized the said relay establishesa lockingcircuit for itselfat its armature '4' 2, connects direct ground to thetest wiper 7 6 at armature 71, opens the rotary magnet circuit atarmature 73, and

atarmatures 70 and 74 connects up the line 1 At the individual linerepeater R the: line relay 123 is now'energized over a circuit traceablefrom ground by way ofthe lower winding oflinerelay 123, working'contact.

and armature 132, lower left-hand winding of repeating coilI, lineconductor 122', bank. contact 80, wiper 77, working contact and armature74, armature 63 and itsworking contact, armature 55 and its working contact, lower winding of'impedance co l 43,

armature 60 andit's working contact, workmg contact and armature '59,upper winding ofimped-ancecoil 43, resting contact. and a armature 07,working contact andarinature 61, armature 70 and its working contact, v

7 5, bank contact ,78', line conductor wiper l 120, working contact andarmature 130,

upper left-hand winding of repeating coil I, armature 131, auditsworking contact, and upper winding of line relay 123 to battery.

Relay 1 123, upon energizing, closes a circuiti'or slow to'release relay126 at armature 129. 1 1 Release relay 126, upon energlzlng,

prepares awcircuit for the slow to release ringing relay 128 at armature137, and at armature 135 connects ground to conductor 1 21. a a a Theconnection having been finally completed theringing.arrangement will nowbe explained, The calling subscriber maynow operate-his calling devicein accordance with the third digit 0, or the first,and in this case, theonly code ringing digit. As before, a series of ten. interruptions isproduced in the line cir'cuitto whichthe line relay 40 againresponds,nthis time, however, by transmittingaiseries er teninterruptions to the line relay 12am? thelrepeater R by opening andclosing itscircuit at armature 55. Responsivesto these interruptions theline relay 123 transmits a series of ten impulses to the ringing. relay128 ,overapath traceable from grounded armature 13a and its restingcontact,'armature 1&1 and its resting contact,

armature 137 and its workingcontact, and.

winding of relay 128 to battery. Relay 128,

beingslow to release,holdsup during the impulsmg and connects generatorGEN, and

ground to conductors 151 and152 at armatures'. 139 and 1 1-0,respectively, whereby ringing current is projected out over the lineincluding substation A to operate the.

'ing relay 12S releases-its armatures the talking-connection willibefinally completed. A

\ further result of the lifting of the receiver is the closing of acircuit for impulsing relay 125 which may-betraced from ground, 1m-

pulse springs of the calling device 166,

working contact and spring 169, bell 165,

line conductors .151 and 152, upper and,

lower righthand windings of repeating coil I, and relay 125 to battery;Relay 125, upon energizing, further opens the circuit ofringingrrelay128 at armature 13a to prevent ringing on the line when thereceiver is off the switchhook.

. The desired connection has now been established. The transmitter at,the calling substationA is supplied with'talking battery through thewindings of theline relay 40, while the transmitter at substation A issupplied with talkingbattery locally through the primary winding of theinduction coil 167. The voice currents take the path shown in heavylines which will be understood with out further explanation.

When the subscribers are througlrtalk ing, theywill both replace theirreceivers, and the replacement of the receiver at substation A causesthehneswrtch C and the connector repeater D to be released in thefollowing manner: l/Vhen the line circuit is broken by the replacementoi the receiver the line and release relays 4 0 and 11 are bothdeenergized, and a circuit iscompleted for the release magnet 51 whichoperates to restore the connectorrepeater D to normal positionin thewell known manner. Relay 11 also disconnects ground from the releasetrunk conductor .85 thereby permitting the switching relay 1 1 of theline switch C to deenergize. By the deenergization of relay 14; the lineswitchC is restored to normal condition ready for another call. lVhentheconnector repeater D restores to normal position the circuit oflinerelay 123 of the-individual line repeater R. is broken, whereuponsaid relay deenergizes and opens the circuit of relay 126. Relay 126,upon deenergizing,

removes ground from the release trunk;-

conductor 121 thereby permitting the switching relay 104 of the lineswitch G to deenergizev By the deenergization of relay 104 the lineswitch C is restored to normal condition ready for another call. Thereplacement of the receiver'at substation A completes the releasing ofthe individual line repeater R by breakingthe circuit of impulsing relay125, whereby said relay deenergizes, and the repeater is also ready foranother call. a l y c The subscriberat station A may obtain connectionwith the subscriber at station A by removing hasreceiver and diallingthe directorynumber of the substation A which we will assume to be 01-2. The first two digits being those which control the line selection,the connector-repeater D will raise its wipers up opposite the tenthlevel and rotate them in to the iourth set of bank cont acts or to thecontacts of the desired line in response to the dialling or' thesedigits by the calling subscriber as already explained. The callingsubscriber may now dial the third digit 2, whereupon two interruptionsare produced in the line circuit, to which the line relay of theconnector-repeater responds by transmitting two interruptions to theline relay of the repeater. Responsive to these interrupt-ions the linerelay of the repeater transmits two impulses to the ringing relay whichoperates to project ringing, current outover the line includingsubstation A to 1 was, 1

ring while the 2 causes a short ring as has also been already explained.

It will be understood that there may be otherstations on the line whichare signalled in a similar manner according to codes made up of long andshort rings in different combinations.

7 Having described the process of setting up a connection between astraight line automatic substation and ,a plurality of magneto localbattery substations on a line, the reverse will now be described.Forthis purpose it will be assumed that the subscriberat "station Adesires to obtain connection with the subscriber at station Al In orderto do this, the subscriber A removes his receiver and dials thedirectory number of the subscriber A.

-When the receiver is removed at substation A, it and the secondarywinding of the in duction coil 167 are bridged across the line,

while a simplex dialling circuit is completed over theline conductorsfor the line relay of the individual line repeater which may betracedfrom ground at the calling device 166, working contact and switch hookspring 169 to the center point of the bell 165 where it divides andextends over the line conductors 151 and 152, armaturesi139 and 140 andtheir resting contacts, the right hand windings of the repeating coil 1,and impulsing relay 125 to battery. Upon energizingfthe 1mpulsing relay125 closes a circuit at'armature 13 1 for relay 127 whereupon this relayenergizesjand'actuat'es its armature 138 to prevent a circuit from beingclosed for relay 124- when ground is placedon the, holding trunk by theindividual line switch. A further result of the energization ofimpulsing relay 125 is the closing of a circuit at armature 133' forline relay 103 of the line switch Cwhich may be traced from ground,resting contact and armature 110, conductor 102, conductor 122, lowerlefthand winding of repeating coil ,Larmature 132 and its restingcontact, upper left handwindmg of repeating coil I, worklngcontac't andarmature 133, conductor 120, conductor 100,

armature 108 and its resting contact, and through line relay 103 tobattery. The operation of line switch C" is identical with that of lineswitch 'Calready explained and need not, therefore, be repeatedhere. Itmaybe assumed, however, that when the call is initiated the wipers ofthe line switch .C'x are, rotated step by step 111111311 they cometorest on the idleybank contacts of the trunk lineshown in the drawing.Under these circumstsnces the switching relay, 104 energizes and extendstheline conductors 100 and 102 to the upper and lower windings of thedouble woundv line relay 40 of the connector repeater D; i V I lVhen;the calling line .isv extende'd to the switch .D- as above described,this switch operates in the manner already described to prepare acircuit for the vertical magnet; connectground to the release trunk,thereby closing a holding circuit for the line switch C; and to extendground to multiple connecte'd test contacts in the banks of theconnector repeaters which haveaccess to the line including substation A,whereby the said line is made busy.

The calling subscriber at station A may now proceed to operate hiscalling device 166 in accordance with the "digits in the local telephonenumber of substation A. When the calling device is operated for thefirst digit a series of interruptions is produced in the simplexdialling circuit; to whichthe impulsingrelay 125' responds bydeenergizmg a corresponding plurality of times.

The deenergization of impulsing relay 125 causes a correspondingdeenergization of line relay 40 of connector-repeater ID by interruptingits circuit at armaturev 133. The circuit of relay 127 is likewiseinterrupted at armature 134-,but being slow to release, this relay holdsup during the dialling operation.

The line relay 40 in turn transmits acorre- ,spondjng series of impulsesto the vertical magnet to raise the switchjwipersv step by step untilthey standopposite the levelbf bank contacts in which is located the setof contacts associated with the line. of substation A, which in thiscase we will assume to be otherthan. the tenth level. The slow torelease series relay, which is energized in series with the verticalmagnet, maintains its armature attracted throughoutthe verticaloperation of the switch, and at the end of the vertical movementdeenergizes and transfers the operatin current to the rotary magnet, ashas already been explained inconnection with a call originating at sub-7 in the simplex dialling circuit, to which the impulsing relay againresponds and in turn causes a corresponding series offmterruptions inthe circuit including line re lay 40'. The relay 40 againresponds bytransmittinga series of impulses tothe rotary magnet which is operatedto, rotate the switch wipers intoengagement with the in the drawing byreference} characters 81, 82 and 83. As previously e'xplained inconnection withtest wiper 79, the test wiper 82'is now connected tothetest relay which tests for the busy.or idle condition of the calledline. If, busy, the 'busy signalling machine is connected to the lowerheavy talking conductor and by means of this-and the repeating coil I atthe individualfline repeater R the calling subscriber is given anaudible busy signal. If the line is idle it 'is cleared of its normalbattery and ground connections in the line switchC and the interruptedgenerator machine is connected to the called line by the switchingrelay, the

ringcut-off relay 45 now being deenergized, to projectringing currentintermittently out over the line in the usu'al inanner to operate thebridged bell at the substation A. It

will be understood that." the return path for 7 the ringing currentincludes the upper winding of the ring cut-offrelay 4:5 and when thecalled subscriberresponds by removing his receiver the ring cut-offrelay is energized and establishes a locking circuitfor itself at itsarmature 62. The ring cut-off relay also opens the ringing circuitatlits armatures 61and63, and at the working contacts of 'thesearmatures finally completes the talking connection. p

The desired connection has now been established: The transmitter atthe'calling 'substation'A isjsupplied with talking battery locallythrough the "primary winding of lthe induction coil 16?, while'thetransmitter at the substation A is now supplied with talking battery,through 'the windings of the double wound back bridge impedance coil 43.y f 5 VVhenthe subscribers are through talking they willbothreplace-theirreceivers. The replacement of the receiver at substation Acauses the individual ,repeater R, the line switch C, and theconnector-repeater D to be released in the following manner 2 WVhenthecircuit of impulsing relay 125 is broken by the replacement of thereceiver, this relay deenergizes to restore the individual line repeaterIt to normal condition and to break the circuit including the line relay40 of the connector-repeater D. The line "relay 40, upon "deenergizing,causes the releaserelay 41 to ole-energize, whereupon the two relays intheir deenergized conditionfcomplete a circuit for the release magnet 51which operates to restore the connector-repeater D to normal position inthe wellunderstood manner. Relay 4,1 also disconnects ground from therelease trunk conductor 85, thereby permitting the switching relay 104;J of the line switch 0' to 'deenergize; By the*de energization of relay104 the line switch C is restored to normal condition ready for anothercall. 3 i

' An explanation of the manner in which}: subscriber on the line havinga plurality of substations thereon can call any other subscriber thereonmay now he proceeded with. The subscriber at station A who desires toconnectwith anothersubscriber on his line will, therefore, remove hisreceiverto determine if the line isbusy ornot and if found idle willoperate his hand generatorl'iO in accordance with the ringing code ofthe desired substation. \Vhen the receiver is removed the impulsingrelay of the individual line repeater R operates to cause the line mayhold conversation, their transmitters being supplied with talkingbattery locally.

hen the subscribers are through talking they will both replace theirreceivers, whereupon the individual repeater R, the line switch C, andthe selected connectorr'epeater will be released in the manneralreadydescribed. 1 I Having described my invention, what I considertobcnew and desire to have protected by LettersPatent'will be pointed outthe appended claims; Whatisclain ed-is: p I I 1. Ina telephone system, aline, a party line havingan individual line repeater, an automaticswitch for connectingsaid lines, a source of ringing-current at saidrepeater, and means controlled by the subscriber on said first'line' forcausing said repeater to variably connect said source .to said partyline for selectively signalling the parties thereon i Thc c ombination,with an'individual line repeater for selectively ringing on a partyline,of a ringing relayvresponsive to fd'igi'ts dialled by the callingsubscriber for connectinggenerator to said party line for a] short orlong period depending upon whether said digits are short 'or long, 3.'Ina telephone system, means including automatic switch; for connecting acalling and called'line,

controlled 'thecalling subscriber for enerizing saidj'relay for a shortor long period, depending upon the digit dialled, an impuls anindividual line repeater for the called line, a ringing relay, means 1ing relay responsive to the lifting of receiver at thecalled substation,and a circuit-for said ringing'relay open'ed'by said impulsing relay.

"45-111 a telephone system, individual lines,

a party line, a connector switch operable to connect with any: desiredone of said lines, automatic r1ng1ng equipment associatedwithsaidconnector for signalling said party line is connected with.

till

5, In a telephone system, individual lines, a party line, a connectorswitch operable to connect with any desired one of said lines, automaticringing'equipm'ent associated with said connector for signalling anindividual line when the same is connected with, means for automaticallyrendering said equipment inetl'ective when said party line is connectedwith, and other ringing equipment controlled at the will of the callingparty for signalling the stations on said party line.

6. In a telephone system, individual lines, a party line, a connectorswitch operable to connect with any desired'one of said lines, automaticringing equipment associated with said connector for signalling anindividual line when the same is connected with, means for automaticallyrendering said" equipment ineffective when said party line is connectedwith, ringing equipment individual to said party line, and means in saidconnector for controlling said individual ringing equipment. y

7. In a telephone system, means including an automatic switch vforconnecting a calling and a called line, a calling device at the call ingstation for controlling said switch in accordance with digits in thecalled number, and a ringing relay individual to the called linecontrolled by said calling device in accordance with other digits in thecalled number.

8. In a telephone system, means including. an automatic sw1tch forconnecting a calling and a cal'led line, a calling device at the callingstation for controlling said switch in accordance with digits in thecalled number, aringing machine, a ringing relay for connecting saidringing machine to the called line for long or short intervals, andmeans controlled by said calling device when the same is operated inaccordance'with another digit for causing a long or short energizationof said relay depending on the value of the digit dialled.

9. In a telephonesystem, means including an automatic switch forconnecting a calling and a called line, a calling device at the callingstation for controlling said switch in accordance with digits in thecalled number, a ringing relay individual to the called line forprojecting ringing current out over the called line for long or shortintervals, and

means controlled byzfisa-id eaumg: device when the sameis opera-ted in.accordance with an additional digit or digits forrenergizing said; relayduring periods of. time dimeetiy proportionalato thlefvalue off thedigits dialled;

l0. Ina telephone system, means ingan automatic switchft'or' connectinga callingandia called line, a :calling device at the calling station torcontro'lling:said" :switchin accordance with digits in the callednumber, -a ringing relay individual to the called line, and meansresponsiveto said calling device when thesamezis operated in ac-..co'rdance with another digit (for energizing said ring ng relay while.'lHlPlllSGS are being transmitted. w p

11. In an automatic telephone system,-'a ringing relay individual to thecalled line for connecting a source of ringing current to the calledline, and means responsive to im-@ pulses generated by the callingdevice at the calling station for energizing said relay whilesaidimpulses are being transmitted.

12. In an automatic telephone system, a connector, a line relay forcontrolling said connector to connect with a called line, and

a ringing relay individual to the called line controlled by said linerelay.

13. In an automatic telephone system, a connector, a line relay forcontrolling said connector to connect with a called line, a

ringing relay individual to the called line controlled by said linerelay, and a second.

relay individual to the called line for breakng the circuit of saidlinerelay.

14. An automatic telephone system comprising individual and party lines,connectors common to said lines, means in each connector forsignallingthe individual lines but not the party lines, signalling meansindividual to each party line, and means in each connector forcontrolling thesaid individual signalling means. 1

15. In an automatic telephone system, a ringing machine, a ringing relayfor connecting said ringing machine to a called line, and meansresponsive to dialing impulses generatediat the calling station forcontinuously energizing said relay while said impulses are beingtransmitted.

16. In a telephone system, a connector switch operable responsive to twodigits dialled by a calling subscriber to connect with any desired lineterminating in its banks, automatic ringing equipment associated withsaid connector eitective to signal the line connected with when saidline terminates in a certain level of the banks of saidconnector, andmeans for automatically rendering said equipment ineffective when theline connected with terminates in a certain other level of the banks ofsaid connector.

In a telephone system, a connector I sw1tch operable to connect with anydesired tomatically rendering said equipment inefl fective when the lineconnected with terminates in a certain other level of the banks of saidconnector, and other ringing equipment controlled at the will of thecalling subscriber for signalling the line connected with when firstsaid ringing equipment is rendered ineffective. i a

i 18; In a telephone system, means including an automatic switch forconnectinga calling and a called lme, acallmg devlce at r the callingstation for directively controlling \said switchin accordance with twodigits in the called number, a ringing machine common to said switch andother similar switches, a ringing relay for connecting said ed inaccordance with another digit for causing along or short energization ofsaid rela dependingon the value of the digit dialle In witnessjwhereof,I hereunto subscribe my' name this 26thday of November, A. D., 1924. Y a

l ARTHUR J. RAY.

